Abstract: The nano-ZrO2-7%Y2O3 powder produced by domestic company was used to deposit nano-ZrO2 coatings with novel porosity via the three-anode-one-cathode plasma spray system (Delta gun). The orthogonal table L934 was used. The influence of plasma parameters on the porosity and the influence of porosity on the coating bonding strength were studied in detail. It was found that with the help of nozzle of 7mm in diameter, rapid jet velocity more than 250 m/s and high powder feed rate, the porosity of the ZrO2 coatings were among 14.8%~26.2%, the bonding strength were among 13.4~30MPa. The plasma power, flow rate of H2 and powder feed rate were important factors, the stand-off distance within 100~140mm had no significant influence to the coating property.
Keywords: Nano-ZrO2；Delta gun；Novel porosity；Thermal barrier coating
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